K-Ar age of the Cenozoic volcanic rocks in the Nangqen Basin, Qinghai Province and its geological significance |
| |
Authors: | Wanming Deng Hongjuan Sun Yuquan Zhang |
| |
Institution: | (1) Institute of Geology, Chinese Academy of Sciences, 100029 Beijing, China;(2) Institute of Geochemistry, Chinese Academy of Sciences, 510640 Guangzhou, China |
| |
Abstract: | The Nangqen Basin is one of the typical shearing-extensional basins situated in the north part of the Hengduan Mts. Nine ages
of the Cenozoic volcanic rocks from the basin by K-Ar isotope-dilution technique have been reported in the note. The apparent
ages of whole rock and separated biotite range from 32.04 to 36.50 Ma. The40Ar-K (%) correlation isochronal line shows that there existed neither argon excessing, nor radiogenetic argon loosing, i.e.
the age represents the true diagenetic time. Volcanic activity in this area occurred in the post-collision environment and
is controlled by lithosphere substantial thickening and violent intercontinental shearing-strike slip faults. There is age
difference of the magmatic activity in the east, the west and the north Tibet. The multi-periodic eruption-intrusion of the
magmatic melt since Cenozoic is a tracer showing the pulsating uplift of the Tibetan Plateau. |
| |
Keywords: | Nangqen Basin volcanic rocks K-Ar age Tibetan Plateau plateau uplift |
本文献已被 SpringerLink 等数据库收录! |
| 点击此处可从《中国科学通报(英文版)》浏览原始摘要信息 |
| 点击此处可从《中国科学通报(英文版)》下载免费的PDF全文 |